Self-assessment is a process through which you become aware of your strengths and weaknesses, skills and abilities, interests, values, goals, and aspirations. For our purposes, self- assessment is aimed at preparing you to feel comfortable in interview situations where the topic is YOU.
The two self assessment interview questions about 'strengths and weaknesses' are often seen as nuisance questions by interviewees. The questions aren't seen as directly relevant to the job, or sometimes even embarrassing.
They're very relevant, because they're really about the applicants. The interviewers usually don't know the interviewees. This interview question puts them on the spot.